Polyacrylamide-hydroxyapatite composite: Preparation, characterization and adsorptive features for uranium and thorium

被引：48

作者：

Baybas, Demet ^{[1
]}

Ulusoy, Ulvi ^{[1
]}

机构：

[1] Cumhuriyet Univ, Fac Sci, Dept Chem, TR-58140 Kayseri, Sivas, Turkey

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2012年 / 194卷

关键词：

Hydroxyapatite; Composite; Uranium; Thorium; Adsorption; AQUEOUS-SOLUTIONS; ALUMINOSILICATE COMPOSITES; BIOGENIC HYDROXYAPATITE; HEAVY-METALS; LEAD IONS; REMOVAL; SORPTION; UO22+; PB2+; TEMPERATURE;

D O I：

10.1016/j.jssc.2012.07.039

中图分类号：

O61 [无机化学];

学科分类号：

070301 [无机化学];

摘要：

The composite of synthetically produced hydroxyapatite (HAP) and polyacrylamide was prepared (PAAm-HAP) and characterized by BET, FT-IR, TGA, XRD, SEM and PZC analysis. The adsorptive features of HAP and PAAm-HAP were compared for UO22+ and Th4+. The entrapment of HAP into PAAm-HAP did not change the structure of HAP. Both structures had high affinity to the studied ions. The adsorption capacity of PAAm-HAP was than that of HAP. The adsorption dependence on pH and ionic intensity provided supportive evidences for the effect of complex formation on adsorption process. The adsorption kinetics was well compatible to pseudo second order model. The values of enthalpy and entropy changes were positive. Th4+ adsorption from the leachate obtained from a regional fluorite rock confirmed the selectivity of PAAm-HAP for this ion. In consequence, PAAm-HAP should be considered amongst favorite adsorbents for especially deposition of nuclear waste containing U and Th, and radionuclide at secular equilibrium with these elements. (C) 2012 Elsevier Inc. All rights reserved.

引用

页码：1 / 8

页数：8

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